21．A．commonly B．probably C．partly D．simply
55. A. person B. bird C. visitor D. friend
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In Twain, many people know what a “motorpool” means. It is 21 known as a place for the maintenance of official business and government cars. 22 it is a place for vehicle maintenance.
More than ten years ago I came to America on business and I took advantage of the 23 to visit my friend. My friend drove a car to 24 me at the airport, and took me to his home. Out of the 25 ,my friend drove his car into the innermost 26 , which had a sign“carpool only”. I 27 what“carpool”meant. I felt doubted whether he was going to a motorpool. 28 I thought myself clever in asking:
“Is there anything wrong with the car?”
“Nothing. 29 ?”said he.
“Well then, why are you going to carpool?”I 30 .
My friend couldn’t help 31 and told me that“carpool”refers to the lane that only the cars with two or more 32 can drive in. I felt rather embarrassed on 33 that.
After dinner, my friend’s neighbour came over to ask whether he 34 “carpool”the next day.“ 35 ，”my friend said“Iwil accompany my friend to go shopping tomorrow.”I was 36 again, wondering why he could not“carpool”with him since we had“carpooled” 37 .My friend explained to me again that the“carpool”that his neighbour 38 meant they in turn drove the car to work so as to save energy. The first“carpool”is a noun, 39 the second“carpool”is a verb. It is really 40 for newcomers in America to understand it in a short time.
54. A. direct B. private C. proper D. sudden
53. A. as B. unlike C. besides D. with
52. A. medicines B. areas C. measures D. effects
51. A. injured B. disabled C. discovered D. cured
50. A. diseases B. chickens C. hospitals D. fears
49. A. form B. sickness C. pain D. disaster
48. A. because B. though C. if D. while
47. A. killed B. unknown C. rejected D. infected